public class Example4_10 { 
   public static void main(String args[]) {
       Lader1.下底=100;     //Lader1的字节码被加载到内存,通过类名操作类变量
       Lader1 lader1One=new Lader1();
       Lader1 lader1Two=new Lader1();
       lader1One.设置上底(28);
       lader1Two.设置上底(66);
       System.out.println("lader1One的上底:"+lader1One.获取上底());
       System.out.println("lader1One的下底:"+lader1One.获取下底());
       System.out.println("lader1Two的上底:"+lader1Two.获取上底());
       System.out.println("lader1Two的下底:"+lader1Two.获取下底());
    } 
}
